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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c6bb51982e025ca33c117c4a747a07a4ea435568767180cc13fb6e7d14f1e08' 
  AND token = '1Qw60m27OoNaH8JLXji5M6KtalLl2rpuleU62zp9pqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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