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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cfe7237a30706b4ec2cf8f70770635e1b84864a23145c9f184e0db3d4f92838' 
  AND token = 'o50fk4AZoylmLtPxvSWDXRKxYAn4eeiWbsgJSYTNyAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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