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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '148a209b304f263ea7837cc7eeea15c8c9bd9ffd713246e72e94f40297ddad7b' 
  AND token = 'm2oWCNEuxGMOg2RUlbSGghDys6fXR9JNDclGrGGx3KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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