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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0109974206d3531a681231ec109d92f9b1192c0df22828321af6cd1493fbc7a5' 
  AND token = '1K3D6oMcrpo0X7Y75B+etEGYWZUaVdV9VTwY9ZHT1Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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