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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a54df94f76f186846b9efe3a1c4a7e1b338083e3e8988e8a1861217fb361cf55' 
  AND token = '7cE9qG2YLhT1lVEEvk37o+TObpNMH9rtTwd+5Z29qz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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