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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3be91cae3538d80c6a00430623ba4c564af296284776a2c5737914000b10002' 
  AND token = 'RkANTWsQWoVhfsEyWtuQ0LNr+0B7bB6Kvf803/Y8lhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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