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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e517a3b262aaec3a4b10b5d7fc6dace604a4e0051e42e3ca5c69a1966e00e85e' 
  AND token = 'E7mPJAk7MNST86RBWFQxrAJyz+FTkPOOX10NN8sfHu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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