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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd2b7733a6239aca20cb620b519a14ea222a919413f8aba4da7f841325ce50bc' 
  AND token = 'p9M9ODEHUp9wNOqDVnT53qCiuoxGPJS29/2GM+nrWmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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