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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e875694eb78caf7e268a2a54c5c18f612898e6f165852322d5d978fb7652c8d8' 
  AND token = 's1mhwVOCz0S70Eo0jWSh5dtTbiRZMaf3QZPtSTRH+MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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