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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6211ba60547f55484bbda4c17b2f316283407edcb36df9f526da8620518c7a7' 
  AND token = 'cCDDmr5ZY5+X1DuE5iktNHduUPCh/8+nQJ3+NRQ1hl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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