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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ec048d6b2a9a52e728b2a2e733150e158f8d51f9676772849a8c259ebc913db' 
  AND token = 'o2TpciqpIwfyk334IrGbp8Oc0Uqe9eZTQNRX5xFQ7n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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