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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b30cea0d517378e7e57b9280ec517ce3f800c14af257c7610a80a3127ec125b' 
  AND token = 'KQIDRqtpn35jumcB/LNE3ITT1nQrdXGn56nzh99FheE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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