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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db6300acfec2ec90c3392d165b2880d6404db03d8c89e448dd530def1830a812' 
  AND token = '1T2yoqGWnjgDtH3Ljd82EedsOMeWTk8/CF5k2VPC3a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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