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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebe791b89bc5b1f6b98fb59c6a2dd5fed9e2a2d5f9c862ad7bca32f11d356954' 
  AND token = 'oQqD/hbeBtuCMmaMcX8HkjCMG4/l6whB/2eIN4r10z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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