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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56d225e85dbb9676d7b2c17510b8a9e0fef5e7d45bf539d0bab8f9d5341b9760' 
  AND token = 'q4ygn2nZvH6nnSetCHc6eCtV9XiV+1KgxR9PoJ14FEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}