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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c3e97ff971cea90b77026bfc8bcf736670507da666f5dd35e8131a4b60109c6' 
  AND token = 'Lr6TDG3jnNTWV32tDMIi7yozxu1tRYUXYR+a09hKUws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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