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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b796c78ba8080b7e2fe941a2fb1521ba7e1e6ab1c1cfe9890a1166098b9f4402' 
  AND token = 'E/ZOHWAAENwD26B+BUdgUkkSRIe6AdvRKQuylI7tqKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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