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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4b27b9d5fe26241aaa60d87f01559adc976a8443836c3b874681c3b3a8449d5' 
  AND token = '4pv/8o1CaNxhBkK6/6VyjskfOFhjqxN5R4mA2cD7fvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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