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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f4b3f34bddb3a710a843eaf00d3de15f4e1b301bca47d7522bd110c4e84319d' 
  AND token = '+FJG0WWZ3Bbh2KkZiqtvLMYKiEMGSUqRC+xsBEuM3Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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