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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc8af8e71b280b812d10e3e8f62782dee9256aec007f4fef530d72b760ba77b5' 
  AND token = '9iHtJslXpwpGxMJIoqZQReNqe5+z0Yn2TvSZRBTLQas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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