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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ee47882c9c98f022a4a23986297e8dfe5079427bf03721b7880106739715dc9' 
  AND token = '/cobq+ipZ21F038IUWHnNxNr6FHyuh+QySE2bZ9B0rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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