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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '086b7edea91e0540153aafa890d1c004c06d1444e5c18703cc37b74543c3ace4' 
  AND token = 'pfqT4vGZPcj/MUd10H/E+7f9KHYdga9KYQbgGrRthaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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