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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b113d1c449e741f3c44027b0a0e09501955847601437ed6477c7768c35c4880' 
  AND token = 'Ur6C+slPmidFkElfswRArejHpi+6bs7dLzJQFG89c8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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