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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4e71a5b1f9b5e47680985cd595f45877000da3797241b5162442564f88348dd' 
  AND token = 'RqCG0QEuEkoa9DfoQZJe4A26V18g02WDvjxLKsue2Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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