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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94b72d293746c13d06121ee0037eeaccaefe05403da94e94082f0523143a4e43' 
  AND token = 'oyOakvPkdFKJTy5hdvwo1E812a7x901ZA43Jq9pPqmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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