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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce123768d1a1a946db3b286cd8976451cc8dcb0f7b15ad936ec5da70827c9201' 
  AND token = 'g0DILJfgnt7g9+UiJPRLNadpx9x3YWk3HdiJuVIxX98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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