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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1c93867d26029624aacbff86099d8a7ff7ea452c476819ab38d790a60bb2af9' 
  AND token = '3HGYBH77ZEdGMACn9uLfEEa83eD5F2dz84401/5AO/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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