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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97137a1f09fbd129456352b22233e77190e33f22c4049a791a00ae7f8fac2cf9' 
  AND token = '3eNcoK252um7gdfSk0fcitFtsSEJaqlf0oT0qynx2F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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