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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d7cee7618f6c5415ab14a952e971046ad646d96e0032b641ac28c559f11a4dd' 
  AND token = 'YCfp7L+hB2+CFthKOfHl03DkPRLGA+uyMVej210iyko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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