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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58cd8907ea6117181aed0528307c2abd8bf7badd664ac79ee3f7d66dd33d30d' 
  AND token = 'EQuO/Qqeq5IeU9BUoZX4yOvgLf9NHIDOaOysZl95BKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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