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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db4d918f8debea5044dff1b548677e74775dbd4f43c0809bef1bc0b0bc3f15f8' 
  AND token = '5UW2yCVXHL+aRlXI53+g+xYUvWpSaId24ElI5RIVeWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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