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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaf8be4355ce7c6529fd322a37cc3bc07464c1efa27500673610ab2ee81d1cad' 
  AND token = 'kEs61quz0WnXqnami11kiRlm2XXrgsvEp9HCjBbSPcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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