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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cc447cea31e428e6d860fcf10e37a7879a94c8632fca861087ccec7cd58a80f' 
  AND token = 'nx3lmEniNFBGvhZJehylj6C3wWi7RS95F03SgJHYbwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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