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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8810f2ec4fd608bc1f9bcd9d92e37cf3d0fbdb2a4d4e95313c044afa0cd5eecc' 
  AND token = 'Pzlbjvth9IGcF6JK53PdTgAZqeDAsZeyTK4FEVd8aM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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