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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f95540b35e224ef80747c4c1b7caf2cba9ea351c4e33c4d93240cd89a6a37a08' 
  AND token = 'dyOyNM+i6trfTCiMSkTt6X6uEMJd0Agh1a6cYf+9+vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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