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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adc5d254483f6a5f1a432a37ef3f2f4e9ea6cfcbfb9e1e7330bf23bf22e929b1' 
  AND token = 'XpnXaNxsJ2KJyU9sqyX1ffNLxDWe33CbFozdC2kDDng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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