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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a09228f2636e90be31e1769500a2783068df71519d8ad90a6aba731c5b7fa0e' 
  AND token = 'b/ykldxal/yINhUIhkPW/cqKwd1Wux36N/o3k+5pgp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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