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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75e2daacf354c4d8dcc02b7e47216dc59631f484ddf072b91d375a41a9afef7f' 
  AND token = 'w5qMy9aGydhu8dMzPyupnKjUBK79l4ELn9WwWM4F7rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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