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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0c12de53d47bfbf1015492c7f71bc820de2e325d7c09a22279bf6928bd86f22' 
  AND token = 'TBMLGQP2J+13HirasMmFslGU8bMEa2hvwwyqsuxj0wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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