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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dced80304175b3d48b69cfe6e2bc9d85d638133782532a37f00903891d2d019' 
  AND token = 'vCoMgHoOXo5ExjHjywLewUbse3KinmeLYp2eOZokUB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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