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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2d38a07f00714519821094e0ad2b585ceea794a0df547d14fe7c1c7c0c1eac9' 
  AND token = 'L3vx7YYO+YSsS2V2x1jyEYE2f5z1yP2AmW8MRc7ddNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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