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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '700ccf076a7bfabeeaea62e1aee0b51ed856be0753ad110fce46204e4fc227cb' 
  AND token = '/PfXteVj1M4T5vntfFY19QO7suv/TXaSc8d/Yfo+xb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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