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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc6c777d3c5147e1ecfff0d0a3811eec158906f5337bd5b2e52ad37a1ec96074' 
  AND token = 'BF2wsEM06O4B2p6mbCjDzl3gISGBNsJ2p7i9uOjLcjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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