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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '78b9511d1ae4d4bebe887385ae3bfccfe409bdfc4c947c6b52ae7769860e6d93' 
  AND token = 'eIABgOaOZbP9EXW9nosLD/eJcxx5DO5gpqEwiOC3/HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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