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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a66b128fc26c53870b157f700982f70d5f7fbc60c4cae0ea632a4bd8ceaf9fb3' 
  AND token = '6ux+4CzcE2VmSnmXLmisr1NEK8coDjbaCjErl/Raj+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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