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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc6cfc4b5ab8911e7d7f56bad05c97631ed66e51e16607d8c78bd1b020e38d52' 
  AND token = 'wEFr0/xr6R+as+bNYoX5gPKnU8EZOTciN/AtzYGv0VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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