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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3058e10d9c1f324c92ff9a8e923a1dbebf0c21acbd501b0703b3beb25f0d5f44' 
  AND token = 'mQ9KjyAnA3tZLxQE3UCjmOYaTwhoxfgtFV8VqWs94HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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