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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aea27880c1d2d457389f0cc874eafb8bc95b3df1f47125198382ccb4b11bb2b8' 
  AND token = 'V3kggEU+vnSnLtZm4D9/479oDiVA6/iz+U7S8n7ksYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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