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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e132d04a01707d7afa0c8de37ceb4a7d06324a0eaf8b7e9dcfc3bc1030309168' 
  AND token = 'Js3GSNJjZpWKhmVsyS1p8a2Ygr5h2/VGOO+KCyb0Q8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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