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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b1655232f1fc9c13de6c0016e432bd5252a91d206668b68083919f8d1eb6e6a' 
  AND token = 'aiNcEiv4qnNHqv+2AKTPsvp8m0Xm8jddpj7m9/wDl2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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