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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '973fd587872bc471d57d2d8ceb05f0f21f5afad4bf0bd57c8cddae27ce3b86e3' 
  AND token = 'vwS03AlhkLXmwlaq28WXXH4MmFij9wa/nlT9y4v3Xb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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