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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd01759f745a1dd32d5abaef4a871a7afa5d86bac36a26dc1e59e27f296d13bff' 
  AND token = '0kbSDRul2xLs2QaLtYaNMw44ZbWhntKFrAKCg8m3kBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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