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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f3c3467ec5c2f6e2c17166278c91e3576b5c4ffe82fafbed34a53ef6a359701' 
  AND token = '/xJKKKtkiH05h67X3yJ4ktEBlELwY4B8Q2fLqx11SP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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