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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e987a961837eafcf6ac7383c5907a7520f9a01b3fe5a90f1142d3e93c18ed5f' 
  AND token = 'VxBNyY7DXSSQA7NDubsAV1o4K1nmhrYXOktEGEP0Zfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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