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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a5419cd5f5cbb405490ce38beac0bb358c75a0ef067cca7cdc5f2f9a4d1ba4c' 
  AND token = 'DjGEj5I9xF7LFztV4si0WhTFDJ3nWkAQZzIlAH4/I5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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