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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efbfe04295c9e75bc4b888ac8fa7f86a6f5f747f9e155e0c7e596b66fe586f6d' 
  AND token = 'Zu1PSdpGjbNPLEKzNOje/pTHGRh+AJX8kTRO5bKMoPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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