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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaa0a551a0b542f174183409db2e7a041d006c88a588847e8b5b6b999a49ca89' 
  AND token = '6LTQPYC8Pu5A5YhM8BwAIs9+k5ypOFgxti6NVN0VGYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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