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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faae2a1cbc9142accd613a4089354454f50cbba5b5e387b0df8934f49bb09967' 
  AND token = 'Nt+LCc+mHz13mP6v6YQi3oIveBycd/k+iMaYmUAojLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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